1. Tom’s parents wanted to know how he liked the school. Tom said the school was all right, but it was nothing to write home about.
2. When we asked them about their trip, they said they couldn’t complain about it but the hotel was nothing to write home about.

Antonyms: something to crow about; a feather in one’s cap. The expression originates from the idea that if one were writing a letter to one’s family, the person or thing or event in question is so ordinary or insignificant that one wouldn’t even mention it in the letter.